ATE30998T1 - ELECTRICAL MONITORING SYSTEMS. - Google Patents

ELECTRICAL MONITORING SYSTEMS.

Info

Publication number
ATE30998T1
ATE30998T1 AT84300906T AT84300906T ATE30998T1 AT E30998 T1 ATE30998 T1 AT E30998T1 AT 84300906 T AT84300906 T AT 84300906T AT 84300906 T AT84300906 T AT 84300906T AT E30998 T1 ATE30998 T1 AT E30998T1
Authority
AT
Austria
Prior art keywords
circuit
fault
switching device
current
ground
Prior art date
Application number
AT84300906T
Other languages
German (de)
Inventor
Louis Michael Frank
Original Assignee
Raychem Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=23851121&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=ATE30998(T1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Raychem Corp filed Critical Raychem Corp
Application granted granted Critical
Publication of ATE30998T1 publication Critical patent/ATE30998T1/en

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0202—Switches
    • H05B1/0208—Switches actuated by the expansion or evaporation of a gas or liquid
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
    • H02H7/226—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices for wires or cables, e.g. heating wires
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices

Landscapes

  • Control Of Resistance Heating (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Keying Circuit Devices (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)
  • Alarm Systems (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

Electrical systems, especially elongate heating systems, include means for monitoring circuit continuity and/or absence of ground faults. The systems comprise a switching device, e.g. a thermostat, as well as a circuit breaker. When the switching device is on, a relatively high current passes through the circuit and when it is off, little or no current passes through the circuit. In one embodiment, a small controlled residual current flows in the circuit even when the switching device is off, and a current-detecting device signals when a discontinuity causes the current to drop below the expected value for the residual current. In another embodiment, the switching device is placed so that the heater (or other electrical load) is at a positive potential with respect to ground even when the switching device is off, and a ground fault indicator is used to compare the currents in the two legs of the circuit and to signal when a ground fault causes the currents to differ. Preferred circuits make use of both these embodiments. Preferably the fault circuits are powered by the same power source as the circuit which is being tested, but the fault indicators continue to signal faults even when the circuit is no longer powered, and both correction of the fault and powering of the circuit are required to cancel the fault indication.
AT84300906T 1983-02-14 1984-02-13 ELECTRICAL MONITORING SYSTEMS. ATE30998T1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/466,265 US4520417A (en) 1983-02-14 1983-02-14 Electrical monitoring systems
EP84300906A EP0121990B1 (en) 1983-02-14 1984-02-13 Electrical monitoring systems

Publications (1)

Publication Number Publication Date
ATE30998T1 true ATE30998T1 (en) 1987-12-15

Family

ID=23851121

Family Applications (1)

Application Number Title Priority Date Filing Date
AT84300906T ATE30998T1 (en) 1983-02-14 1984-02-13 ELECTRICAL MONITORING SYSTEMS.

Country Status (6)

Country Link
US (1) US4520417A (en)
EP (1) EP0121990B1 (en)
JP (1) JPS59157983A (en)
AT (1) ATE30998T1 (en)
CA (1) CA1225700A (en)
DE (1) DE3467676D1 (en)

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4667194A (en) * 1984-11-02 1987-05-19 Raychem Corporation Monitoring system for use with elongate heater units
US4751495A (en) * 1986-01-28 1988-06-14 Raychem Corporation Analog pulsed heat trace monitor or the like
US4799019A (en) * 1987-03-02 1989-01-17 Charles Cooley Electrical continuity load monitoring circuit
US4888660A (en) * 1988-06-17 1989-12-19 Academy Of Applied Science Shock-proof mains voltage supply outlet and method
US5973896A (en) * 1995-05-26 1999-10-26 David C. Nemir Shock and arc protection device for an electrical distribution system
US5844759A (en) * 1995-05-26 1998-12-01 David C. Nemir Electrical fault interrupter
US5818012A (en) * 1996-05-09 1998-10-06 Wrap-On Company Inc. Self-regulating cable assembly
US5710408A (en) * 1996-08-15 1998-01-20 Msx, Inc. Automatic controlled for an ice and snow melting system with ground fault circuit interruption
US5763858A (en) * 1996-10-03 1998-06-09 Jones; Thaddeus M. Automatically controlled ice and snow melting system including a two-wire remote control
US5920191A (en) * 1997-11-12 1999-07-06 Wrap-On Company, Inc. Current flow monitor for heating cables
US6218647B1 (en) * 1998-01-19 2001-04-17 Msx, Inc. Method and apparatus for using direct current to detect ground faults in a shielded heater wire
US6084207A (en) * 1998-01-19 2000-07-04 Msx, Inc. Method and apparatus for using direct current to detect ground faults in a shielded heater wire
US7400477B2 (en) 1998-08-24 2008-07-15 Leviton Manufacturing Co., Inc. Method of distribution of a circuit interrupting device with reset lockout and reverse wiring protection
GB9822515D0 (en) * 1998-10-16 1998-12-09 Alstom Uk Ltd Improvements relating to monitoring apparatus for electrical circuits
DE10003064C2 (en) * 2000-01-25 2002-06-27 Wacker Werke Kg Tool with an electrical consumer and a protective device
US7209651B1 (en) * 2005-12-07 2007-04-24 Aos Holding Company Fluid-heating apparatus, circuit for heating a fluid, and method of operating the same
US7256372B2 (en) * 2005-12-07 2007-08-14 Aos Holding Company Fluid-heating apparatus, circuit for heating a fluid, and method of operating the same
ES2895936T3 (en) * 2006-12-11 2022-02-23 Electrical Grid Monitoring Ltd Prediction of failures in electrical transmission networks
US20090133283A1 (en) * 2007-11-27 2009-05-28 Michael Paul Ricklefs Relay commutation sequence for multiple element heating system
WO2010005987A2 (en) * 2008-07-07 2010-01-14 Leviton Manufacturing Company, Inc Fault circuit interrupter device
DE102009032953A1 (en) * 2009-07-14 2011-01-20 Wabco Gmbh air dryer
CA2774364C (en) 2011-04-18 2014-01-28 Norman R. Byrne Electrical system with circuit limiter
DE102013212764A1 (en) 2013-06-28 2014-12-31 Schmidhauser Ag power converters
US10541557B2 (en) 2016-10-07 2020-01-21 Norman R. Byrne Electrical power cord with intelligent switching
US11424561B2 (en) 2019-07-03 2022-08-23 Norman R. Byrne Outlet-level electrical energy management system
US11994303B2 (en) 2020-05-12 2024-05-28 Watts Regulator Co. Smart thermostat and a thermostat adapter with integrated safety interlock for installation and diagnostics of an in-floor heating system

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB880238A (en) * 1958-12-16 1961-10-18 Michael Cornelius Gerrard Protective arrangements for electric circuits and apparatus
US3410984A (en) * 1966-05-03 1968-11-12 Gen Electric Flexible electrically heated personal warming device
US3534353A (en) * 1967-07-11 1970-10-13 Bell Telephone Labor Inc Current limit detector
US3548398A (en) * 1968-01-11 1970-12-15 Walter E Strimling Switch position and continuity indicator for a pair of heating circuits
GB1386792A (en) * 1971-04-08 1975-03-12 Rotax Ltd Electrical heating apparatus for reducing or preventing the formation of ice on aircraft parts
US3766434A (en) * 1971-08-09 1973-10-16 S Sherman Safety power distribution system
US3997818A (en) * 1973-07-05 1976-12-14 Bodkin Lawrence E Load selective power systems
JPS531911Y2 (en) * 1973-08-11 1978-01-19
DE2461964C2 (en) * 1974-12-31 1977-02-24 Matsushita Electric Ind Co Ltd CIRCUIT FOR DISPLAYING THE LOWER VOLTAGE OF A VOLTAGE SOURCE
JPS5224795A (en) * 1975-08-19 1977-02-24 Nippon Sheet Glass Co Ltd Frame for conveying laminated boards
US4080641A (en) * 1976-07-12 1978-03-21 Rca Corporation Ground fault detector
US4068276A (en) * 1976-07-14 1978-01-10 Interelectronics Corporation Protective system for electrical appliances
DE2903509A1 (en) * 1978-02-10 1979-08-16 Bimak Srl ELECTRIC POWER SAVING DEVICE FOR A YOGURD MAKING MACHINE
JPS5947530B2 (en) * 1978-07-20 1984-11-20 松下電工株式会社 Power outage compensation adapter
JPS5950021B2 (en) * 1978-11-21 1984-12-06 三菱電機株式会社 electric floor heater
JPS57206240A (en) * 1981-06-12 1982-12-17 Hideo Sugimori No-break power source
US4421976A (en) * 1981-08-26 1983-12-20 General Signal Corporation System for monitoring heater elements of electric furnaces
DE3141661A1 (en) * 1981-10-21 1983-05-05 Brown, Boveri & Cie Ag, 6800 Mannheim Device for monitoring circuits
US4436986A (en) * 1981-11-23 1984-03-13 Sunbeam Corporation Electric blanket safety circuit

Also Published As

Publication number Publication date
CA1225700A (en) 1987-08-18
DE3467676D1 (en) 1987-12-23
EP0121990A1 (en) 1984-10-17
US4520417A (en) 1985-05-28
JPS59157983A (en) 1984-09-07
EP0121990B1 (en) 1987-11-19

Similar Documents

Publication Publication Date Title
ATE30998T1 (en) ELECTRICAL MONITORING SYSTEMS.
DE60236651D1 (en) MEASURING DEVICE
JPS6447276A (en) Electric source circuit
ES8202452A1 (en) Static tripping device for an electric circuit-breaking switch.
US4227145A (en) Apparatus for detecting faults in electric cables
GB1060643A (en) Electrical fault detection arrangement
KR960008201B1 (en) Circuit breakers test device
US3913010A (en) Means and method for measuring electrical-ground resistance between earth-separated locations
GB1005941A (en) Improvements relating to testing devices for testing protective switches
US4081854A (en) Meter protection circuit
US3376502A (en) Apparatus having standard impedance calibration means for testing the impedance of an electrical ground and including polarity reversing switch means
US3753088A (en) Device for testing the adequacy of electrical circuit such as the ground circuit of an extension cord
JPS5540939A (en) Impedance measuring unit
ES482672A1 (en) Detection of failure of consumers of electrical current
GB1590946A (en) Cable testing apparatus
SU991542A1 (en) Device for relay protection with testing it under load
KR890000624Y1 (en) A tester
SU870926A1 (en) Device for contact diagnostics
US1876324A (en) Ground resistance meter
JPS6488264A (en) In-circuit tester
SU673507A1 (en) Device for monitoring the operation of power transformer of railway signal point
SU1698795A1 (en) High-voltage checker
RU2121696C1 (en) Device for indication of current modes in electric equipment
SU761947A1 (en) Apparatus for monitoring direct-current electric circuits
SU472346A1 (en) Monitoring device for contacting probe installations